Content-type: text/html Man page of mlib_ImageBlend

mlib_ImageBlend

Section: mediaLib Library Functions (3MLIB)
Updated: 2 Mar 2007
Index Return to Main Contents
 

NAME

mlib_ImageBlend - blend with an alpha image  

SYNOPSIS

cc [ flag... ] file... -lmlib [ library... ]
#include <mlib.h>

mlib_status mlib_ImageBlend(mlib_image *dst, const mlib_image *src1,
    const mlib_image *src2, const mlib_image *alpha);

 

DESCRIPTION

The mlib_ImageBlend() function blends two images together on a pixel-by-pixel basis using an alpha image, when alpha is also on a pixel basis. The alpha image can be a single-channel image or have the same number of channels as the source and destination images.

It uses the following equation when the alpha image is a single-channel image:

dst[x][y][i] = a[x][y][0]*src1[x][y][i] +
              (1 - a[x][y][0])*src2[x][y][i]

It uses the following equation when the alpha image has the same number of channels as the source and destination images:

dst[x][y][i] = a[x][y][i]*src1[x][y][i] +
              (1 - a[x][y][i])*src2[x][y][i]

 

PARAMETERS

The function takes the following arguments:

dst

Pointer to destination image.

src1

Pointer to first source image.

src2

Pointer to second source image.

alpha

Alpha image used to control blending. The a value equals (alpha * 2**(-8)) for MLIB_BYTE image, (alpha * 2**(-15)) for MLIB_SHORT image, (alpha * 2**(-16)) for MLIB_USHORT image, and (alpha * 2**(-31)) for MLIB_INT image.

 

RETURN VALUES

The function returns MLIB_SUCCESS if successful. Otherwise it returns MLIB_FAILURE.  

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE

Interface StabilityCommitted

MT-Level

 

SEE ALSO

mlib_ImageBlend_Fp(3MLIB), mlib_ImageBlend1_Fp_Inp(3MLIB), mlib_ImageBlend1_Inp(3MLIB), mlib_ImageBlend2_Fp_Inp(3MLIB), mlib_ImageBlend2_Inp(3MLIB), attributes(5)


 

Index

NAME
SYNOPSIS
DESCRIPTION
PARAMETERS
RETURN VALUES
ATTRIBUTES
SEE ALSO

This document was created by man2html, using the manual pages.
Time: 02:37:58 GMT, October 02, 2010